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Asphalt batch mix plant A machine laying asphalt concrete, fed from a dump truck. Asphalt concrete (commonly called asphalt, [1] blacktop, or pavement in North America, and tarmac or bitumen macadam in the United Kingdom and the Republic of Ireland) is a composite material commonly used to surface roads, parking lots, airports, and the core of embankment dams. [2]
Oldcastle Materials Inc. is a supplier of asphalt, concrete, and other building materials, and also offers construction and paving services. The Atlanta-based company is a subsidiary of CRH plc, a publicly traded international group of diversified building materials businesses, [2] [3] and has approximately 18,000 employees at 1,200 locations, as of March 2018.
In 2005, Vulcan acquired 11 aggregates operations and five asphalt plants in Arizona, Georgia, Indiana and Tennessee. On February 19, 2007, Vulcan announced that it would buy stone and cement producer Florida Rock Industries for $4.7 billion. [6] [7] Vulcan completed the acquisition of Florida Rock on November 16, 2007. [8]
Prior to 1999, Tarmac Plc was an aggregates to construction company dating from 1903. It was demerged in July 1999, with the Construction and Professional services arms forming Carillion plc. The aggregates and building materials side of the business retained the Tarmac name and was bought by Anglo American shortly afterwards.
Tarmac Building Products is a British producer of building products, based in Wolverhampton. The company was formerly part of the Tarmac Group, but was bought in 2014 by the joint venture of Lafarge and Tarmac's parent Anglo American, Lafarge Tarmac. [1] Lafarge Tarmac was subsequently sold to CRH plc in August 2015 and rebranded as Tarmac. [2]
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Stone mastic asphalt (SMA), also called stone-matrix asphalt, was developed in Germany in the 1960s with the first SMA pavements being placed in 1968 near Kiel. [1] It provides a deformation-resistant, durable surfacing material, suitable for heavily trafficked roads.
A more durable road surface (modern mixed asphalt pavement), sometimes referred to in the U.S. as blacktop, was introduced in the 1920s. Instead of laying the stone and sand aggregates on the road and then spraying the top surface with binding material, in the asphalt paving method the aggregates are thoroughly mixed with the binding material ...